<div dir="ltr"><div dir="ltr"><div style="font-family:arial,sans-serif;font-size:13px">Dear all,</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">
I'm working on a complex network design problem involving robust constraints, reformulated as linear matrix inequalities.</div><div style="font-family:arial,sans-serif;font-size:13px">I'm trying to solve the problem using csdp. For small instances, everything works fine, but for larger ones I get very quickly an error, given below. Most of my constraints are linear constraints, more precisely, flow conservation constraints.</div>
<div style="font-family:arial,sans-serif;font-size:13px">Any clue on why this happens ?</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Best regards,</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Michael. </div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">
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<div>Iter: 0 Ap: 0.00e+000 Pobj: 2.2969834e+008 Ad: 0.00e+000 Dobj: 0.0000000e+000</div><div>Iter: 1 Ap: 8.79e-001 Pobj: 2.5279101e+008 Ad: 8.91e-001 Dobj: 1.2389219e+011</div><div>Iter: 2 Ap: 8.09e-001 Pobj: 2.8075298e+008 Ad: 8.85e-001 Dobj: 1.6902705e+011</div>
<div>Iter: 3 Ap: 5.08e-001 Pobj: 2.7716885e+008 Ad: 6.89e-001 Dobj: 3.4354074e+011</div><div>Iter: 4 Ap: 3.80e-001 Pobj: 2.3436358e+008 Ad: 2.19e-001 Dobj: 3.4354074e+011</div><div>Factorization of the system matrix failed, giving up.</div>
<div>Failure: return code is 8</div><div>Primal objective value: 2.3436358e+008</div><div>Dual objective value: 3.4354074e+011</div><div>Relative primal infeasibility: 1.28e+007</div><div>Relative dual infeasibility: 1.29e+004</div>
<div>Real Relative Gap: 9.99e-001</div><div>XZ Relative Gap: 4.26e+002</div><div>DIMACS error measures: 7.08e+007 0.00e+000 7.25e+005 0.00e+000 9.99e-001 4.26e+002</div></div></div></div>